Arc-lamp.



W. DlETZ.

ARC LAMP.

APPLICATION mm APR. 30. 1914.

Patented July 18, 1916 3 SHEETS-SHEET I.

w. DIET Z, ABC LAMP;

APPLICATION FILED APR; 30,I9l4.

Patented July 18, 1916..

3 SHEETS-SHEET 2.

w. DIETZ.' ARC L AMP.

APPLlCATlON FILED APR. 30, 1914. 1,191,289. Patented July 18, 1916.

. 3 SHEETS-SHEET 3,

O 45 l 16 O,

half their usual brillianc WILHELM DIETZ, 0F LiEUTZSCH MATHIESENAKTIENGESELLSCHAFT, OF LEUTZSCH, IN EAR LEIPZIG, GERMANY.

ARC-LAMP.-

Specification' of Letters Patent.

Patented July 18, 1916.

Application filed April 80, 1914. Serial No. 835,469.

To all whom it may concern:

.Be it known that I, IVILHELM DIETZ, a

subject of the German Emperor, residingat 9 Bismarckstrasse, Leutzsch,near Leipzig, Germany, have invented a new and useful Arc-Lamp, of whichthe following is a specification.

This invention has for its object to aflect the light (by which is meanteither extin-v guishing the lamp or decreasing or increasing the lightgiven by it) given by one or more are lamps connected in series withoutaffecting that of the others. According to this invention this iseffected by momentarily changing the strength of the current. For thispurpose there may be employed a pair ofmagnets and a movable memberadapted to be moved to and-fro under the influence of the magnets, themomentary abnormalcurrent causing the movable member to directly orindirectly close a circuit which permanently affects the strengthof oneof the magnets. One magnet is preterably the main lamp magnet, the otherthe shunt magnet andfthe movable member the carbon feed regulator.

The invention is particularly applicable for street lighting in which itis' desired either to extinguish at a given hour some or all-of thelamps inthe series or to make some or all of the lamps burn withdiminished brilliancy.

'lh e;invcntion is illustrated in theaccompanylng drawings in whichFigure 1 shows alamp circuit to one or more of whose lamps the inventionmay be applied; Fig. 2 shows a lamp which can be extinguished by amomentary rush of current and Figs. 3 and 4 show lamps which can be madeto 'give less light by the same means. i

In Fig. 1, 1 is the primary winding of a transformer for constantcurrent, 2 its movable secondary anda 7) c d e are lamps in seriesconnected to the secondary winding 2. The lamps a c c for example may belamps in accordance with this invention so that these can beextinguished while the lamps 7) and (l continue to burn. Or all or someof these lamps may be made to burn with 'ing ,thefshunt magnet againstthe contact 18.

In the drawings lamps are shown in which the abnormal current is asudden rush of current and the lamp is either extinguished or made togive a decreased light.

In Fig. 2, 3 is a disk, tis the main lamp magnet, 5 a shunt magnet; thedisk 3 is NEAR LEIPZIG, GERMANY, ASSIGNOR T0 KfiRTING 8i.

adapted to move about its axle 6 anticlockwise under the influence ofmagnet 4 and clockwise under the influence of magnet 5. 7 is a quadrantmoving with the disk 3 and operating a chain 8 and thus the clutch 9 ofthe upper carbon 10 which through a chain 11 passing. over a pulley 12,is connected to the lower carbon. 13 is a contact moved by the disk 3and 14 is-a small re sistance. 15 and 16 are the main lamp terminals. l7and 18 are contacts in the path of the movable contact 13.

The disk 3 oscillates under the influence of the magnets 4 and 5 toregulate in the usual manner the carbon feed. l/Vhen however a rush ofcurrent is purposely transmitted from the centralstation the magnet 24moves the contact 13 to an abnormal extent thus causing it to makecontact with the contact 18. The lamp is now extinguishedbeingi shortcircuited upon the resistance 14 thus depriv- 5 of nearly all our- Pentwhich has for effect that the magnet 4:

when again energized to the normal extent will continue to hold'thecontact 13 firmly out the lamp voltage becomes higher than the normalthus causing the magnet 5 to become stronger and the disk?) to moveclockwise bringing th contact 13 against the contact 17 thusextinguishing the lamp. The magnet 4 will now receive no current whileby arranging that the resistance 14 shall cause a fall in tension about4 to 6 volts, the magnet 5 is given the necessary strength to hold thecontacts 13 and 17 together.

In the'lamp illustrated in Fig. marked Ste 17 are equivalent to those somarked in Fig.2. The magnet 5 is as before normally excited by a Windingindi-. cated in this figure by 24 and can also be excited bya secondwinding 25 terminating in a contact 22. 26 is a contact arm adapted tomove. about a pivot and provided with a tail 27 in'the path of abutments28 and 29 If acarbon burns 3, the parts moved by the chain 8. Exactly inthe same manner as in Fig. 1 a rush of curre t will cause the disk 3-tomove anticlockwise thus lifting the ob ain .8 and causing the abutment 528 to strike the tailf27 thus moerating the contact arm and moving itagainst the contact 21- sWitching in the auxiliary \vinib ing 25. Themagnet 5 is now energized by its two wini'lin'gs causing the disk 3 toretate clockwise. lVith the normal lamp current the length of the arcWill now be per-.

manently reduced and therefore the lamp will give less light thanbefore. W hen the lamp is switched out the carbon clutch 9 falls and theabutment 29 strikes the tail 27 of the contact arm 26 thus moving itaway from the contact \Vhen the carhome are consumed the contact 13 willcome against the contact 17 and thus switch out the lamp.

Fig. 42 is a modification oi" the lamp shown in Fig. 3 contacts areavoided. -.Similar figures indicate similar parts. 19 is a lever armpivoted at 20 and carrying the ,core 21 of a solenoid 23. Vllhen arushof ciixgrent is sent the, disk 3 rotates anticlockwise and the contactarm 13 raises the lever arm 19 about its pivot so making contact betweenthe arm carrying so the core 21 and the Contact Current can now passthrough the Winding 25 and the solenoid 23 'inseries ith-it. This hasfor effect to rotate the disk clockwise and to hold the core 21 inposition thus permanently-shortening the arc and diminishing the light.

When in the claims I speak of altering the-light given by the lamp, Imean either extinguishing the lamp or decreasing or in- 40 creasing thelight given by it.

' What I- claim is 2- 1. In an arc lamp system, a plurality of lamps inseries, certain of said lamps being provided with means operated by theelec- 4-5 trode feeding mechanism for altering the amount of light givenby the lamp on a change of current from normal, means for supplying acurrent of normal strength to the series of lamps and including meansfor momentarily varying the current from normal to operate said lightaltering means.

.2. In an arc lamp system, a lamp having electrode ft'eeding means, saidmeans including-a main lamp magnet, means operated by the electrodefeeding mechanism'for altering the amount of light given by the lamp ona change of current from normal through said magnet, means for supplyinga cuz-"ent .ofnormal strength to the series of lamps and 10 includingmeans for momentarily varying the current from normal to operate saidlight altering means.

T 3. In'lan arc lamp system, a plurality of series, electrode feedingmeans for in which mechanically operated lamps, certain of said lamps.being provided said lamps. said means including a pair of magnets and amovable member operated thereby, certain o'l' said lamps being providedwith means operated by the electrode feeding mechanism for altering theamount of light given by the lamp on a change of. current from normal,means for supplying a normal current to the series of lamps andincluding means for momentarily lllyll'lg the current from normal tooperate said light altering means. l. In an arc lamp system, a pluralityof lamps in series, electrode feeding means for said lamps, said meansincluding a pair of magnets and a movable member operated thereby,certain. of said lamps being provided with means operated by theelectrode feeding mechanism for altering the amount of light given bythe lamp on a ,change of current from normal, said means comprising a svitch member operated by said movable member, means for supplyinganormal current to the series. of lamps and including means formoi'nentarily varying the current from normal to operate said lightaltering means.

In an arolamp systemy'a plu ality of lamps in series, electrode feedingmeans for said lamps including a pair of magnets, certain of said lampsbeing provided withmeans operated by the electrode feeding means forchanging the strength of current through' one of said magnets foraltering the amount of light given by the lamp on a change of currentfrom normal, means for supplying a current of normal strength to theseries of lamps and including means for momentarily varying the currentfrom normal to operate said light altering means.

(5. In an arc lamp system, a plurality of with means operated by theelectrode feed ing mechanism for altering the amount of light given bythe lamp on a change of current from normal, said means comprising aswitch, means-for supplying a current of normal strength to the seriesof lamps and including means for momentarily varying the current fromnormal to operate said light altering means.

7. In an arc lamp system, a plurality of lamps, certain ot-said lampsbeing provided with means operated by the electrode feeding mechanismfor altering the amount of light given by the lamp on a change ofcurrent from normal,'said means comprising, a 1 short circuiting device,means for supplying a current of normal strength to the series of lampsand including means for momentarily varying the current from normal. tooperate said light altering means. 125

' 8. In an'arc lamp, electrode feeding mechanism comprising a'series andshunt dnagnet, and a pivoted member movable in one direction by vtheseries magnet to e'parate trodes, upon the pasfisl ge of current abovethe electrbdes; and movable in the other dithat which separates-theelectrodes at normal 10 rectio'n by the slgimt magnet to feed the elecd:arcing distance. trodes, a move e switch member operate 6b? said pivotedmember, a switch contact in WILHELM DIETZ' position tO be engaged by themovable switch Witnesses: member" on movement of the feeding mech--R-IGHA2?!) FRETZDORFF, anism in e, (iirection to separate the elec-PAUL HEYGK.

